Unitarisation of the hard pomeron and black-disk limit at the LHC

Details Unitarisation of the hard pomeron and black-disk limit at the LHC Unitarisation of the hard pomeron and black-disk limit at the LHC

2006-12-05

arxiv.org/abs/hep-ph/0612046v1

Phys.Lett.B662:417-423,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 12 figures, latex

Scientific paper

10.1016/j.physletb.2008.03.033

Recent models of soft diffraction include a hard pomeron pole besides the usual soft term. Such models violate the black-disk limit around Tevatron energies, so that they need to be supplemented by a unitarisation scheme. Several such schemes are considered in this letter, where we show that they lead to a large uncertainty at the LHC. We also examine the impact of unitarisation on various small-t observables, the slope in t of the elastic cross section, or the ratio of the real to imaginary parts of the scattering amplitude, leading to the conclusion that the existence of a hard pomeron in soft scattering may be confirmed by LHC data.

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